Question

5. The cost of a dozen pencils is Rs m. Find the cost of n pencils.
[Hint. What is the cost of one pencil?]​

Answer 1

Answer:

Step-by-step explanation:

Cost of a dozen(12)pencils=Rs 18

Cost of one pencil= 1/12 ×18 =Rs 1.5

Answer 2

Answer:

The cost of n pencils is Rs. $\frac{mn}{12}$

Step-by-step explanation:

Given information,

The cost of  a dozen  pencil is Rs. m

We have to find out the cost of 34 pencils.

As we know that,

one dozen = 12 substance

So,

a dozen of pencil means 12 pencil .

The cost of 12 pencils = m

The cost of one pencil = $\frac{the \: cost \: of \: 12 \: pencils }{12}$

The cost of 1 pencil = $\frac{m}{12}$

The cost of 1 pencil = $\frac{m}{12}$

The cost of n pencils= The cost of 1 pencil × n

The cost of n pencils = $\frac{m}{12}$ × n

The value of n pencils = $\frac{mn}{12}$

Hence,

The cost of n pencils is Rs. $\frac{mn}{12}$